One AMD is custom driver, the other is native.
I couldn't find any evidence of jumbo packets.
Per Wojciech's advice, I took a capture from each AMD and was not seeing the same results as that screenshot. I've opened a support ticket to investigate this discrepancy further.
The fragmented packets metric refers to IP fragmentation - i.e. IP packets with a MTU larger than the MTU of a network they crossed on their way, which caused them to be split into smaller packets by a router.
The AMD does not support reassembling IP fragments. A fragment rate of 99% is extremely high though. You should record a capture file on the AMD and examine it in Wireshark to see whether it really consists mainly of IP fragments.